nothing annoys me more then short chapters, i know you want to create mystery and whatnot, but just like any good author you need to learn to provide some meat to the chapter, before you give us a cliffy. otherwise, try and combine a cliffy chapter, with a scene break where you could have showed what either voldy or the ministry were doing.
please don't take this the wrong way, but chapters like this, show little planning, and little to no skill when it comes to writing...
i hope you the best, i hope you have this planned, and i look forward to seeing you ideas.